Crank-pin-turning tool



Mar, 13, 1923.

-A. WEBER CRANK PIN TURNING TOOL Filed Jan. 5, 1921 IN V EN TOR.

Patented Mar. 13, 1923.. v I I Y I UNITED STATES PATENT oFF c-E.

ALEXANDER. WEBER, or LOS ANGELES, CALIFORNIA.

CRANK-PIN-TURNING TOOL.

Application filed January 3, 1921. Serial No. 434,838.

T dl h m it may are held on the inner faces of the legs 3 and Be it known that I, Annxaxonn TEBER, a 4:, respectively, by means of screws 6, 6, etc. citizen of the United States, and a resident The tool supporting portion 1 of the body of Los Angeles, in the county of Los An- B has a longitudinal channel 7 formed theregeleS,-State of California, have invented new in, which is closed at its outer end by means 60 and useful Improvements in Crank-Pinof a transverse portion 8,the said channel Turning Tools, of which the following is a extendlng in the opposite direction throughifi tio i out the length of the body 'portion 1 and My invention relates to tools of the charupwardly into the leg 3 of the' extension E,

10 acter shown in my pending application for. as shown in Fig.1. 65 patent, filed February 10th, 1920, Serial No. A tool carriage is provided for holding the 357,721, and an object is to provide a tool ool in operative position relative t th k partaking of the characteristics of that, and 1S movably supportedon the body by shown in my previous applicationbut having means of a block C which has an angularl substantially difl erent form. t 3 {cut recess 9 formed in the upper forward 70 A further object is to provide a tool of edgethereof to receive the tool T,..said tool th character t ted nd ad t d t b mhaving afwidth corresponding to the length ployed in a turning lathe or other suitable of the crank pins to be finished thereby. A machine for initially finishing or refinishing clamp C is provided on the topof the block the pins of crank shafts suchas are used in C for holding the tool firmly seated in the 75 internal combustion engines so that the perecess 9 and is adapted to be held detachably riphe'ries of all of the pins will be positively thereon by means of a cap screw 10, one porll L. tion 11 of said clamp engaging the top of Another object is'to provide suitable adthe block C and the opposite portion 12 justments for accommodating the tool to difthereof engaging the top of the tool T, 21580 ferent sizes of crank shafts. shown in Fig; 1. v

Still another object is to provide a form lock C' has a depending extension 13 of tool whereby it will be possible to so mawhich extends into the channel 7 of the body chine the pins of the crank shaft that a true portion and serves to guide the tool carcircle will be generated and the work will be rlage in its movement over the body, a plate 85 held in such a position relative to the tool 14 being attached thereto on the lower side that accuracy may be at all times preserved of the portion 1 of the body by means of during the turning operation. screws 15, 15 for retaining the carriage in Referring to the drawing hereto annexed, operative position, as shown in Fig. 5.

in which a single embodiment of my inven- A screw S is provided on the body B and 90 tion is shown: has a bearing in the end 8 of said body, the

Fig. 1 is a side elevation of my improved 'forward end of said screw being threaded tool, partly in section, showing the tool and and extended through the depending extenthe work in operative relation and in readision 13 of the block C. An enlargement 16 40 ness for a finishing operation. is formed on said screw adjacent to the bear- 95 Fig. 2 is a partial plan view of the same. ing 8 and a stationarily held collar 17 Fig. 3 is an end elevation of the same. is held on the extended portion 18' of Figs. 51 and 5, and 6, are respectively, said screw on the oppositev side of said transverse sections on lines 44, 55, and hearin as shown in Fig. 1. A hand 66, of Fig. 1. wheel is attached to the end ,ofthe por- 100 Fig. 7 is a view showing my tool in opertion 18 of said screw by means of which the ative position in a lathe. screw may be turned for advancing or re- My improvementsinclude an integral body tracting the tool carriageby means of'the B having a main tool supporting stem 1, a connections just described. Suitable graduhandle extension 2 disposed at an obtuse anationmay be provided on the hand wheel 10:5

gle relative thereto and a work holding anand on the stationary collar 17 for regulatgular extension E, one of the legs 3 of which ing and determining theextent of movement is at right angles to the handle extension 2 of the screw so as to roperly set the tool T- and the other leg 4 of which is at right anrelative to the work for making cuts of gles to the leg 3. Bearing plates 5 and 6 desired extent.

It'will be noted that the elevation of the tool cutting edge 6 corresponds with that of the apex of the angle formed by the junction of the two bearing plates 5 and 6 on extension E, and said tool when adjusted to different positions for different sized crank pins will always be in a line paralleling the up per face of the body portion 1. It will also be noted, as indicated in Fig. 1 that lines drawn at right angles to the plane of the plate 5' of leg 3 of extension I] and cutting the axis of the circles of crank pinsof different diameters will, while necessarily intersecting'the bisecting line of the angle between the legs- 3 and 4 a-tthe axes of said circles, also intersect the horizontal line of the tool cutting edge and the apex of the angle at points cutting the peripheries of said circles. Thus the cutting edge of the tool T will at all times be positioned slightly above the horizontal center lines of the circles and the work will be confined between the tool T and the bearing plates 5 and 6 in the finishing operation.

It is a common practice in the use of other tools for this purpose to so confine the work that the pressure of the tool thereagainst will be exerted substantially in the direction of the apex of the angle and the tool will be held practically on the bisecting line of the angle, but a true circle can not be generated in such a manner and it will be observed that in my tool the pressure is directed against the fiat surfaces of the plates 5 and 6 rather than in the direction of the angle. This tends to preserve the proper form of the pins and to firmly hold the work in contact with two separate and right angularly disposed surfaces and constitutes two separate and spaced supports for the tool as against one in the other manner described.

In addition, however, to the'habove dei scribed means of supporting the work'during the cutting operation, I provide an auxiliary supporting means consisting of a rest R having its lower end pivoted on a transverse pin 20 held in the portion 1 of the body and its upper end 21 engaging the periphery of the work at a point substantially on the bisecting line of the angle between the legs 3 and 4 of extension E. Portion 21 of member R is held upwardly in contact with the work by means of an adjusting screw A which is carried in a block 22 supported in gle cghannel 7 of the'body means of pins A pluralityof bores 24, 24, etc., are pro vided in the body portion 1 for receiving the pivot pin 20 of the rests R, rests of different length being provided for crank pins of dif ferent size and the pin 20 is correspondingly movedlffrom one to the other of the bores 24 for thls purpose. Likewise, a plurality of the bores 25, 25, are also provided in the body portion 1 for receiving the pins 23, 23

from one to another position, The lathe is then. operated by pow r and the handle H of the tool will rest against the bed IJ of the lathe chuck in same manner as the connecting rod ends of an engine will move around the axis of the shaft bearings, and the tool' T will engage and cut the periphery of the work W, throughout its entire length atone operation and to a uniform extent, until the proper diameter of the pin is attained.

Thereafter the tool may be changed to another of the )ins and the operation repeated until all of t 1e pins are turned to the proper size and are in true parallelism;

What I claim is:

1. A crank pin turning tool having right angularly disposed work engaging surfaces, and a tool movable relative thereto in a line at an angle of more than 45 degrees and cut ting the apex of the angle between said surfaces, a body for supporting said tool having an extension disposed at an obtuse angle relative thereto, and means for confining the work between said surfaces and said tools.

2. A crank pin turning tool having a body, a work engaging surface obtusely disposed relative thereto, another surface at right angles tosaid obtuse surface, a tool I the angle between said surfaces, for confining a pin therebetween, circles of pins of different size having their axis on a line bisecting the angle of said surfaces and said circles being tangential to said surfaces, and the diametrical lines of said circles when extended at right angles to said obtusesurface cutting the line of said tool on the peripheries of said circles at the intersections therewith of said diametrical lines.

3. A crank pin turning tool having a body, a right angular extension thereon having one of its legs disposed at an obtuse angle to said body, a tool held on and movable parallel with said body and in' a line cutting the apex of said right angle, and a rest on said body for en agement with the work at a point substantia ly on a biseoting line of said angle.

4. A crank pin turning. tool including a body having relatively horizontal and oblique stem and handle portions, a leg at right Ill angles to said handle, a right angular extenslon on said leg, a tool held on and movable parallel with said body in aline cutting the apex of the angle between said leg and said extension, and adjustable means for confining the WOIk' between said tool and said legs.

5. A crank pin turning tool including a body, a pair of right angularly disposed work engaging surfaces disposed at angles relative to and integral with said body, a tool for engagement with said Work, and an adjustable rest on said body for supporting Work of difierent dimensions on a line hiseating theangle of said work engaging surfaces.

6. A crank pin turning tool including a body arranged 'for selectively supporting the Work, ALEXANDER WEBER. lVitne'sses:

IRENE BRnEN, J. W. SHEELEY. 

